1.将一堆文本或者变量转换成数组
格式：Array.of(文本)
let arr =Array.of(3,4,5,6);
console.log(arr); //[3, 4, 5, 6]
2.数组内成员的替换
格式：数组.fill(要替换的内容，开始替换的index值，结束替换的index值)
注：包含开始index，不包含结束index
let arr=[0,1,2,3,4,5,6,7,8,9];
arr.fill('js',2,5);
console.log(arr); //[0, 1, "js", "js", "js", 5, 6, 7, 8, 9]
3.数组遍历
1.格式：for..of
es5写法
let arr=['test0','test1','test2']
for (let x in arr){
console.log(x,arr[x]);
}
// 0,test0
1,test1
2,test2
es6输出数组成员
let arr=['test0','test1','test2']
for (let x of arr){
console.log(x);
}
// test0
test1
test2
es6输出index（arr.keys()）
let arr=['test0','test1','test2']
for (let y of arr.keys()){
console.log(y);
}
//0 1 2
es6同时输出数组成员和index（arr.entries()）
let arr=['test1','test2','test3']
for (let [index,val] of arr.entries()){
console.log(index,val);
}
2.格式：arr.forEach
let arr=['js','es6'];
arr.forEach((val,index)=>console.log(val,index));
//js,0
es6,1
3.格式：arr.filter
let arr=['js','es6'];
arr.filter((val,index)=>console.log(val,index));
//js,0
es6,1
4.格式：arr.some
let arr=['js','es6'];
arr.some((val,index)=>console.log(val,index));
//js,0
es6,1
5.格式：arr.map
let arr=['js','es6'];
arr.map((val,index)=>console.log(val,index));
//js,0
es6,1
